I agree with David. I tried a distributor from a Volvo B27F and it was as Bill stated, two equal weights with springs on both. The result was more torque because of the slower mechanical advance. I didn't have to down shift as soon but the overall performance dropped. The original single spring configuration results in an engine that reves more freely. I'd like to know the difference in the advance scale of the B28E distributor which is the Euro spec one. I know Martin others have done performance upgrades in England using that distributor along with other Euro spec modifications. Bruce Benson The weights inside the distributer for the mechanical advance both > work. You are correct that there is only 1 spring but it connects to > the central shaft that the rotor is on. That one spring is all that is > needed. You should see 20 degrees of mechanical advance if it is > operating properly. The other 20 degrees is vacuum for a total advance > of 40 (if everything is working right of course!). BTW the weights are > slightly different but the one spring works both of them. Adding > another spring will only delay the full mechanical advance. Generally > you want it all in as fast as the motor can take it for maximum > performance. > David Teitelbaum > vin 10757 To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/dmcnews/join (Yahoo! ID required) <*> To change settings via email: mailto:dmcnews-digest@xxxxxxxxxxxxxxx mailto:dmcnews-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/